Fixing wrong error codes passed to errnum in empparser.lua
Allow EMP tests to be launched in parallel
Don't make fail unit test asset_tree.lua when the connection to the server is already in progress
The custom typechecker code was early-exiting (not checking the remaining arguments) if a custom typechecking function returned true.
doxygen doc: improving doc generation with various doxygen versions
C SMS API: minor doc improvement
Lua GPIO: fixing one small memory leak, making GPIO files access errors more understandable
Devicetree GPIO handler: minor doc improvement
merge